I have read through the doc and such and I dont see an option for VLAN on the data tab of the web interface. Id like to add vlan 5 for 192.168.1.0/24. We have 3 vlans existing but I didnt add those. Thanks

If you enable encapsulation on a given Ethernet interface, you can create sub interfaces and assign a VLAN ID.

I find it much easier in the CLI. Not sure if it even possible from the Web GUI.

This example uses Ethernet 0/1, but it should apply to the gigabit module ports as well. I haven't actually programmed a 4430, but I know this is how VLANs are done on ethernet ports in the NetVanta. I've done it with the 3430 models. I hope this is what you are looking for.